Browse Prior Art Database

XEROGRAPHIC BACKGROUND SAMPLING APPARATUS

IP.com Disclosure Number: IPCOM000024068D
Original Publication Date: 1979-Aug-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 226K

Publishing Venue

Xerox Disclosure Journal

Abstract

In the xerographic process, it is important to keep the size of background particles (those in the non-4nformational areas of the latent image) to a minimum for good copy quality. When a plurality of background measurements are desired on a photoreceptor containing many images, it is important that the samples are taken in the background areas and not in those solid areas representing information or interimage areas on the photoreceptor.

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XEROX DISCLOSURE JOURNAL

XEROGRAPHIC BACKGROUND SAMPLING

APPARATUS Robert E. Grace

Proposed Classification
U.S. Cl. 355/3

mt. Cl. G03g 15/00

FIG. 1

Volume 4 Number 4 ~uiy/August 1979 491

~TOME~R+

CCD ARRAY

In the xerographic process, it is important to keep the size of background particles (those in the non-4nformational areas of the latent image) to a minimum for good

copy quality. When a plurality of background measurements are desired on a photoreceptor containing many images, it is important that the samples are taken in the background areas and not in those solid areas representing information or interimage areas on the photoreceptor.

A reflectance densitometer can be used in front of a CCD array as shown in Figure
1. The densitometer I. and array 2 are positioned above the photoreceptor, preferably toward one edge of the image 3 portion. The densitometer would sense both light and dark areas on the photoreceptor 4 with the light areas representing background and the dark areas representing information portions of the developed image on the photoreceptor. The output of the densitometer will vary accordingly.

J

REFERE~E

FIG. 2

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XEROGRAPHIC BACKGROUND SAMPLING APPARATUS (Cont~d)

Referring to Figure 2, the densitometer output is compared with a reference signal of a predetermined level representing the background area output of the densitometer. When the densitometer signal corresponds closely to...